Thermodynamic properties of superconductors containing impurities in a crystal-field singlet ground state

Heiniger, F.; Bücher, E.; Maita, J. P.; Longinotti, L. D.

doi:10.1103/physrevb.12.1778

Cited by 19 publications

(16 citation statements)

References 24 publications

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“…Due to the decrease of the inelastic scattering between the CEF ground and first excited states as T decreases, this pair-breaking effect decreases and the curve of H c2 straightens in the low temperature region [38]. Such behavior has been found previously in H c2 (T ) of (La 1−x Pr x ) 3 In and (La 1−x Tb x )Al 2 [39,40]. In scenario (II), because there are two different H c2 (T ) curves for two-band superconductivity, the resulting H c2 could have a nearly linear T dependence.…”

Section: Discussionsupporting

confidence: 78%

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Kakio

Nakagawa

1995

Jpn. J. Appl. Phys.

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To study the possible competition between unconventional and Bardeen-Cooper-Schrieffer superconductivity in the filled skutterudites Pr(Os 1−x Ru x ) 4 Sb 12 , the evolution of superconductivity and the high field ordered phase in single-crystal specimens has been investigated by means of electrical resistivity measurements in magnetic fields up to 18 T. Whereas the upper critical field H c2 (T ) curves have conventional shapes for x < 0.4, the H c2 (T ) curves are nearly linear for x 0.4. For all x, H c2 (0) matches the calculated value of the orbital critical field. Features in the electrical resistivity associated with the high field ordered phase, observed clearly for PrOs 4 Sb 12 , weaken with increasing x and vanish for x 0.1.

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Section: Discussionsupporting

confidence: 78%

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Kakio

Nakagawa

1995

Jpn. J. Appl. Phys.

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“…Here we report our results for Gd 3+ electron spin resonance (ESR) measurements in the LaIn 3−x Sn x compounds used as a reference for our ESR analysis of the CeIn 3−x Sn x series [14]. We extract the effective exchange interaction parameters between the Gd 3+ localized magnetic impurity and the conduction electrons in the normal state [15] and compare it to the value obtained by previous study of the slope of the initial reduction of T c by the Gd 3+ impurities [7,8].…”

Section: Introductionmentioning

confidence: 92%

“…The value of ∆T c /∆c = −1.25(3) K/% reported in Ref. [7] when used in Eq. 4 predicts J f s ≈ 20 meV, in accordance with the one obtained by ESR.…”

Section: Analysis Of the Gdmentioning

confidence: 99%

“…One evidence of this conventional superconductivity was seen by the suppression of T c as a function of magnetic impurities doping for LaSn 3 [7]. The [7].…”

Section: Introductionmentioning

confidence: 99%

“…These materials were characterized as being conventional superconductors [5,6]. One evidence of this conventional superconductivity was seen by the suppression of T c as a function of magnetic impurities doping for LaSn 3 [7]. The [7].…”

Section: Introductionmentioning

confidence: 99%

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Electron spin resonance study of the LaIn_3−xSn_xsuperconducting system

Bittar

Adriano

Giles

et al. 2011

J. Phys.: Condens. Matter

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Abstract. The LaIn 3−x Sn x alloy system is composed of superconducting Pauli paramagnets. For LaIn 3 the superconducting critical temperature T c is approximately 0.7 K and it shows an oscillatory dependence as a function of Sn substitution, presenting its highest value T c ≈ 6.4 K for the LaSn 3 end member.The superconducting state of these materials was characterized as being of the conventional type. We report our results for Gd 3+ electron spin resonance (ESR) measurements in the LaIn 3−x Sn x compounds as a function of x. We show that the effective exchange interaction parameter J f s between the Gd 3+ 4f local moment and the s-like conduction electrons is almost unchanged by Sn substitution and observe microscopically that LaSn 3 is a conventional superconductor.

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The Influence of Spin‐Orbit Interaction on the Electron‐Phonon Coupling in Tl‐Rich Cubic AuCu₃‐Type Superconductors: Comparison with La₃Tl

2023

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In this work, the role of spin‐orbit coupling (SOC) in ATl3 (A = Ca, Y, La, and Th) and La3Tl is investigated by theoretical investigation of their structural, electronic, elastic, mechanical, phonon, and electron–phonon interaction properties. The effect of SOC on the electronic band structures of these compounds is that some of the degeneracies at the high symmetry points that would exist in a scalar relativistic calculation without SOC are removed by considering this coupling. The replacement of La and Tl atoms in LaTl3 increases the value of the density of states at the Fermi level N() by a factor of 2.1. Furthermore, this replacement makes almost all phonon modes in La3Tl softer than those in LaTl3. Both softer phonon modes and higher N() make the electron–phonon interaction in La3Tl much stronger than in LaTl3. The presence of SOC increases the values of LaTl3 by 34% (from 1.151 to 1.542 K) and of ThTl3 by 65% (from 0.479 to 0.793 K), resulting in good agreement with the corresponding experimental values of 1.63 and 0.87 K. The inclusion of SOC also improves the agreement with the experiment for values of CaTl3, YTl3, and La3Tl.

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Thermodynamic properties of superconductors containing impurities in a crystal-field singlet ground state

Cited by 19 publications

References 24 publications

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Electron spin resonance study of the LaIn_3−xSn_xsuperconducting system

The Influence of Spin‐Orbit Interaction on the Electron‐Phonon Coupling in Tl‐Rich Cubic AuCu₃‐Type Superconductors: Comparison with La₃Tl

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Thermodynamic properties of superconductors containing impurities in a crystal-field singlet ground state

Cited by 19 publications

References 24 publications

Photo-Elastic Constants of Proton-Exchanged LiNbO 3

Photo-Elastic Constants of Proton-Exchanged LiNbO 3

Electron spin resonance study of the LaIn3−xSnxsuperconducting system

The Influence of Spin‐Orbit Interaction on the Electron‐Phonon Coupling in Tl‐Rich Cubic AuCu3‐Type Superconductors: Comparison with La3Tl

Contact Info

Product

Resources

About

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Photo-Elastic Constants of Proton-Exchanged LiNbO₃

Electron spin resonance study of the LaIn_3−xSn_xsuperconducting system

The Influence of Spin‐Orbit Interaction on the Electron‐Phonon Coupling in Tl‐Rich Cubic AuCu₃‐Type Superconductors: Comparison with La₃Tl